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<br />,Iudles as the Secretary deems neceesary; (f)
<br />he necessity to a..urelhat Upper Baaln
<br />~onsumptlve uses are not Impaired because at
<br />failure to store sufficient water to assure
<br />deliveries under Section 602(a)(1) and (2) of
<br />Public Law 90-537.
<br />
<br />faking Into consideration these relevant
<br />:actars, the Secretary has determined that the
<br />lCtlv9 storage In Upper Basin reservoirs
<br />arecast for Septem ber 30 r 1984, exceeds
<br />he "602(a) Storage" requirement under any
<br />easonable range of assumptlons which might
<br />,e applied 10 thosallams previously listed.
<br />herefore, the a.cumulatlon ot "602'(e)
<br />torage"ls not the criterion governing the
<br />318asa of water during the current year.
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<br />lexleln Tr..ly Obligation.
<br />
<br />nnual calendar year schedules of monthly
<br />tllverles of water In the IImltrophe section of
<br />e Colorado River I allotted In accordance
<br />th the Mexican Water Treaty .Igned In
<br />44, are 'ormuleted by the Mexican Section
<br />d presented to the United States Section,
<br />ternatlonal Boundary and Water
<br />mml..lor, (Commission), b9forethe
<br />ginning at each calendar year.
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<br />Neutron '~'obed;t~,ri1in.,ollmciisiUrenM(i!~- . ~
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<br />Upon 30 day. advence notice to the United
<br />State. Section, Mexico h..the right to
<br />modify, within the total .chedule, any monthly
<br />quantity prescribed by the schedule by not
<br />more than 20 percent. During water year
<br />1983, Mexico received a total delivery ot about
<br />9,043,000 acr&-,..t at the Northerly
<br />International Boundary.
<br />
<br />Of Iha 9,043,000 acr&-faet 0' mainstream
<br />Colorado River water reaching the Boundary,
<br />about 2,989,000 acr8~feet was delivered
<br />through the Pilot Knob Powerplant wast away
<br />from the AII-Amarlcan Canal. An e.tlmated
<br />5,555,000 acr&-faet wa. rela..ed through the
<br />Laguna Dam. The remalndar 0' the flow at
<br />the Northerly International Boundary was
<br />made up of return flows to the Colorado River
<br />below the Laguna Dam, and returns to the
<br />Gila River below the gaging .tatlon near
<br />Dome.
<br />
<br />Because at the current water supply
<br />conditions, the United State. will make
<br />.cheduled dellverle. 0' 1,700,000 acr&-feet of
<br />Colorado River water to the Republic of
<br />Mexico In calendar year 1984. This release of
<br />water Is based upon average runoff conditions
<br />tor the year. Should the runoff In water year
<br />1984 be substantially above average,
<br />significant releases tor flood control purposes
<br />could be required from Hoover Dam.
<br />Representatives of the Republic of Mexico
<br />will b. kept Informad 0' operating .chedules
<br />through the United States sec1lon ot the
<br />Commission.
<br />
<br />Regulatory Wa.ta.
<br />
<br />Deliveries to Mexico consist 01 rIver water
<br />dallvered to Imperia' Dam and w..te and
<br />drainage return flows from water users below
<br />Imperial Dam. In addition to assuring normal
<br />water deliveries, the small amount of
<br />regUlatory storage space In Imperlal,Laguna,
<br />and Senator Wash Reservoirs was used at
<br />time. to limit potential downstream flood
<br />damages durIng water year 1983. Regulatory
<br />wa.te for water y..r' 964 will depend on the
<br />actual hydrologic conditions occurring during
<br />that time.
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